> I have tried several times to perform an integration(math..2.2.3)B > similar to the following.> > In[1]:=Integrate[(ao+x)^-1 (bo^-2), x]> > The results, however, are always incorrect:> > Out[1]=-ln(-ao+x) <---where the constant "ao" should be positive.> > ... more stuff

Dennis,

It seems to me that you made a typo in your question. Specifically, if yougive Mma the integral

In[1]:=Integrate[(ao-x)^-1, x]

then you probably get (I haven't checked this on Mma myself)

Out[1]:=-ln[-ao+x]

But, try taking a derivative of this, you get the expected answer. Youmight have expected to get

Out[1]:= -ln[ao-x]

and, naturally enough, if you take a derivative of this, you get theexpected answer. So, what's going on? Well, these two answers differ by aconstant: